operation code
order code

Instructions had a 6-bit operation code and two 15-bit operand addresses.

The result of this is an expansion of the instruction set without requiring additional operation codes.

Individual program operations are represented by two-digit operation codes in programming mode.

And a term that probably everybody has heard is opcode, the operation code.

The operation field provided the operation code and a variety of modifiers.

The operation code was unknown to him, but he detected that not much information was stored here.

You didn't just steal the plans and operation codes for the highest security prison in the Protected worlds.

Two-digit parameter types are operation codes and each message must have exactly one.

In the example above, the operation code 03 means submit message.

A single operation code might affect many individual data paths, registers, and other elements of the processor.